Fuel consumption FCRs? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 7 (permalink) Old 03-09-2008, 09:42 AM Thread Starter
SuperStock
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Fuel consumption FCRs?

I must admit I'm a bit disapointed in the fuel consumption of my Bonnie.
One of the atractive things about a 360 twin is [or I thought ie was] good fuel consumption. My bike seems to be getting about the same as evey one elses on this sight. ie. about 44mpg imperial.
But my mates Yamaha XJ 1300 gets about the same, my Aunties HD sport gets about the same too.
I'm pretty easy on the throttle most of the time.
I used to get about 55MPG IMP. out of my Fazer and when I was younger I had a Yamaha XS650 whith a warm cam, some mild head work and a 750 kit, so a very similar set up to my 790 Bonnie and it would average 60-65mpg mpg imp.
Arfter reading through a lot of old threads it seems that those whith better Carbies like FCRs arre getting better fuel ecconomy when not giving the bike big handfulls.
Are the stock Carbies ungood?

2005 Bonnie, grab rail, centre stand,taco, ikons, new front springs, bafflectomy.Metal gear front disk & braded line,K&N,no snork,115s,stock needle.

Last edited by chedd; 03-09-2008 at 09:44 AM.
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post #2 of 7 (permalink) Old 03-09-2008, 11:48 AM
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In theory, you should be getting better milage because the engine is working more efficiently. But rarely is that the case simply because most riders, ride their bikes harder after the swap... because it's so much fun to do so.

Check your plugs of an over-rich mixture. It's easy to do with such big carbs.

/Mike
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post #3 of 7 (permalink) Old 03-09-2008, 02:06 PM
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I'm gettiing about 38 MPG US which is about 45.5 MPG Uk/Imp. So your MPG is about the same as mine. Not great, but better than some of the people I know with this engine that are in the low 30's (US) running different carbs.

A lot of my riding is traffic stop and go, I do get a lot better on the highways;
mid 40's US on the highways.

Tusitala - Mt Vaea
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post #4 of 7 (permalink) Old 03-09-2008, 02:13 PM
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I have tried that and gotten over 60mpg but even for an old man like me that is too boring. I imagine if you really nursed it along you could even get 65-70mpg. I'd rather walk. I normally get 50 mpg US gallon.

There isn't anything wrong with the Bonnie carbs. MPG depends on a lot of things in addition to carbs: your weight, wheel free movement, brake drag, tire inflation, terrain, temperature, humidity, air intake ability to maintain proper ratio, gas quality, tire type and size of contact patch, roughness of the road surface, etc. and on and on....

You want good gas mileage get a bike like Sue's Virago 500 LTD. Touring with me at exactly the same speeds, roads, etc. she routinely gets 65 mpg. Push her up to an indicated 75 mph for a tank full tho, and she drops to 45 mph.

Monte

"The Old Ohio Preacher Man"

Last edited by mecscc; 03-09-2008 at 02:16 PM.
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post #5 of 7 (permalink) Old 03-09-2008, 02:18 PM
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mpg

The bikes are heavy, that's one factor, secondly, they usually get better mileage after 1k or so of use as everything loosens up a bit.
The other aspect is the right hand of most of us...lol...it's just sheer freaking fun to crank that throttle open and listen and feel the bike respond...It's mandatory at least once in my rides....and sometimes more if i'm feeling frisky.
Do a search as well....you will find a wealth of posts in the past..lots of good info which doesn't need repeating on this thread.
Suffice to say, bikes are a luxury item....so who gives a rat's ass what kind of mileage you get....just enjoy the ride....I guess it is interesting in some techno-aspect of most of our brains but not really a big deal.....
Bill

Sitting on a cornflake waiting for the van to come!
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post #6 of 7 (permalink) Old 03-09-2008, 05:38 PM
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'Suffice to say, bikes are a luxury item....'

Not for me, I depend on motorcycles every single day for commuting, I don't drive a car, don't have a huge income, so luxury item they sure ain't, fun yes, luxury toy...hell no! And in this day and age especially with fuel prices sky high in the UK at the moment fuel economy is very important. Us brits are getting screwed!!
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post #7 of 7 (permalink) Old 03-10-2008, 12:42 PM
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In my offroad experiences with FCR's, they have been the thirstiest carbs I have run. They run well, and make great power, but they do like the fuel.

2006 Thruxton
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